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United States Patent | 6,096,849 |
Chung ,   et al. | August 1, 2000 |
The invention relates to linear copolymers containing alpha-olefin and divinylbenzene comonomer units and to a process for preparing the copolymers, the copolymers having a mole ratio of unsaturation/divinylbenzene (TUS/DOU) between 0.8 and 1.1, a molecular weight distribution of less than 4, and a homogeneous composition distribution, and having the structural formula ##STR1## in which R is a linear or branched C.sub.1 to C.sub.10 alkyl group or a phenyl or alkyl-substituted phenyl group, x+y is the mole % of alpha-olefin units in the copolymer, z is the mole % of divinylbenzene units in the copolymer, the sum of x+y is from 50 to 99.9, and the sum of x+y+z is 100. The copolymers are prepared in the presence of a bridged metallocene catalyst having a spacial opening at the metal active site of between 135 and 105.degree. for reacting with only one of the two vinyl groups in the divinylbenzene comonomer, which assures the formation of linear copolymers without detectable branching structure.
Inventors: | Chung; Tze-Chiang (State College, PA); Dong; Jinyong (State College, PA) |
Assignee: | The Penn State Research Foundation (University Park, PA) |
Appl. No.: | 359345 |
Filed: | July 21, 1999 |
Current U.S. Class: | 526/336; 525/105; 525/250; 525/259; 525/285; 526/126; 526/127; 526/134; 526/160; 526/170; 526/348.2; 526/943 |
Intern'l Class: | C08F 236/20; C08F 004/643 |
Field of Search: | 526/336,348.2,126,127,134,160,170,943 525/332.2,105,250,259,285 |
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